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Abstract

This article describes an I/O channel command and data processor instruction which permit programs running on central processors of a data processing system to influence the suspension and continuation of I/O channel operations, and provide programs with access to channel status information without invocation of system interruptions and associated programming overhead. A POST/SUSPEND channel command word (CCW), as defined herein, and a RESUME I/O instruction, also defined herein, respectively provide these suspension and continuation functions.

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United States

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English (United States)

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Page 1 of 2

Post Suspend Resume

This article describes an I/O channel command and data processor
instruction which permit programs running on central processors of a data
processing system to influence the suspension and continuation of I/O channel
operations, and provide programs with access to channel status information
without invocation of system interruptions and associated programming
overhead. A POST/SUSPEND channel command word (CCW), as defined
herein, and a RESUME I/O instruction, also defined herein, respectively provide
these suspension and continuation functions.

The POSI/SUSPEND CCW requires the channel in which it is being executed
to post status information in an area of system main storage which is located
indirectly by address information in the command. It also conditions the channel
to suspend operation relative to a device if a command chaining bit in the CCW is
off and a suspend bit in the initial channel address word (CAW) is on. It also
requires the channel to include a bit in the posted status information indicating
whether it has or has not taken a suspension action.

The RESUME instruction is an I/O instruction designed for central processor
execution. It instructs the executing processor to initiate continuance of
command chained I/O operations in a channel which normally is in a suspended
condition when the instruction is executed. The executing processor does not
have to communicate a CAW to the designated channel inasmuch as that
channel will have preserved the address of the command in process when it took
the suspension action. The channel begins the resumed operation with the
CCW which it would have fetched next had it not taken the suspension action
and had it been instructed by its last CCW to chain to another CCW.

The POST/SUSPEND CCW is a 64-bit expression having the
following form:Bits 0-7: define the Operation CodeBits 8-31: define the address in main storage of a pointer
parameter, which in turn defines an address location

Bits 49-63: represent data--e.g., a status field--to
be posted at the address defined by the pointer

parameter located by means of bits 8-31.

The data in bits 48-63 is stored in the memory space defined by the pointer
located by means of bits 8-31. Thereafter, the value of that pointer is increased
by 2 so that it points to a next posting position two bytes removed from the
position currently being addressed. This next position is accessible for posting
status of another subchannel or channel. If the command chaining flag bit (bit 33) is off, and if the "suspend flag" bit is on in the initial channel address word
(CAW) which defines the location of the initial command in the chain associated
with the present CCW, the channel suspends operation in respect to the sub-